Machine tool and attachment



March 12, 1935. E. J. KEARNEY ET AL.

MACHINE TOOL` AND ATTACHMENT Filed Feb. 17, 192B 5 Sheets-Sheet 1 N .mi

` )NENTOR Z5 Sheets-sheet 2 @A Z 90 E /22 'March 12, 1935. E. J. KEARNEYET L MACHINE TooL AND ATTACHMENT Filed Feb. 17, 1928 7 FlgA iol 112/ 95March Z, i935. E J, KEARNEY ET AL 1,994,221

MACHINE TOOL AND ATTACHMENT Filed Feb. 17; 1923 3 Sheets-Sheet 5 STAnrlmFosrrlou.

l! uNLOck|Na,uncLAMPms 5 Mw umm; counmzn TABLE STARTS 're TURN.

'l 7 s/ Fmg, 5 v "5 \11s i l2 Batz \117 e MA g g/NTORS Patented Mar. 12,1935 tanni y f orifice MACHINE TOOL AND ATTACHMENT 'Edward Qi. Kearney,Wauwatosa, and Joseph B.

Armitage,` Milwaukee, Wis.,

assignors to Kearney & Trecker Corporation, West Allis, Wis., acorporation of Wisconsin Application February 17, 1928, Serial No.254,971 v claims. (o1. 90421) This invention relates to machine tools,`and more particularly to attachments therefor.

An object is to provide for machine tools having reciprocatory work ortool movements, an improved attachment adapted for rotary indexmovements. v

Another object is to provide an attachment for rotary indexing withimproved means for control of the index movement.

Another object is to provide an attachment havingrotary index movementswith Yimproved means of driving and control from the driving and controlmeans inherent in a machine tool, particularly the driving and controlmeans for the reciprocatory work or tool movements thereof.

Another object is generally to improve andA Fig. 1 is a front elevationof a knee type milling machine including an improved rotary'index at- Ytachment and embodying the invention.

' Fig. 2 is a right side elevation` of the same Vmachine and attachment.Y

Fig. 3 is aplan view of the same attachment enlarged. In the upper rightquadrant the rotary table memberisbrokenaway to show a plate member onwhich it rotates and in the lower right quadrant the plate member alsois broken away.

Fig. 4 is a vertical section along lineV 4-4 of Fig. 3. f

Figs. 5, 6, 7, 8, 9, 9d and 19, are vertical sections or partialsections along correspondingly marked lines of Fig. 3.

Figs. 11, 12, are diagrams showing the relation of certain mechanismshown in Fig. 3.

13 is a rear view of the attachment and portions oi the supportingstructure.

Fig. 14 is a partial plan view in reduced size andL mostly in secton,showing clamps etc. also shown in Fig. 3, and certain operatingmechamsm,

A column 1 supports a rotatable' tool spindle 2, a rotatabledrive'pulley 3, a knee or support 4 guidedV on the front column wall forvertical adjustment, a saddle or support 5 guided on the knee'for crossadjustment, and a table or support 5 6 guided on the saddleforlongitudinal adjustment. Together such supports provide for reciprocableadjustment of table 6 in three transverse directions relative to spindle2.

A'base member '7 consisting of portion 8 and 9 10 xed together isremovably fixed on table 6 by .the means of suitable clamps 10, of wellknown form. Mounted on base 7 for-rotatable indexing movement is Aa worksupport or table 11. The

base 7 and table 11 are portions of an attachment 15 providing for arotatable indexing-movement of work pieces mounted `on the table 11 inaddition to the three transverse reciprocatory movements obtainable fromthe movable knee, saddle and table. Y

The slidable mountings of knee 4, saddle 5, and table 6 Will not beVdescribed in detail since such do not vary from-well known practice.

Spindle 2 may be driven from pulley 3 through transmission mechanismconsisting of shaft 12, 25 gears 13, 14, 15, a clutch generally denotedby the numeral 16, a shaft 17, a rateV changer gen- `erally denoted bythe numeral 18 and driving shaft 19, and gears 20 and A21 between shaft19 and the spindle.` The clutch 16 may be of any 30 suitable type but inthe drawings consists of a member 22 slidably keyed on shaft 17 andmovable to engage or disengage complementary friction surfaces 'on themember and on the gearv 15. The member 22 may be moved by the means 35of a hand lever 23 fixed on a shaft 24 upon which is also fixed a lever25 having a pivoted shoe 26 engaging an annular groove 27 in the hub ofthe member.` The rate changer 18 may be of any suitable form but inthedrawings consists of the l different diameter gears 28, 29, 30, xedtogether and slidably keyed on shaft 17 and shiitable for engagement oneat a time with complementary gears 31, 32, 33, iixed on shaftr19. Gears28, 29,

30,` may be shifted by the means of a hand lever 16, shaft 17, a ratechanger generally denoted by the numeral 38 and effective between shaft17 and a shaft 39, an extensible universal joint shaft generally denotedby the num-eral 40 and effective between shaft 39 and a shaft 41 movablewith saddle 5, bevel gears 42V, 43, shaft 44, gearing 45, 46, 47, areverser generally denoted'by thek numeral 48 and a screw 49 journaledin the table and in threaded engagement with a nut 50 iixed in thesaddle.' The rate changer 38 may be of any suitable form but hereconsists of different diameter gears 51, 5,2, 53, fixed on-shaftf17and,l

engagable one at a time by complementary gears 54, 55, 56 xed togetherand slidably'keyed onr shaft 39, being shiftable by the means of a handlever 57 xed on a shaft58, upon which is also iixed a lever 59 havingfapivoted fork 60 engaging the sides of gear 55. Jointl shaft .40',is ofwell known form providing for power connection between shafts 39V and 41in any position of Saddle'5. .Reverser 48 may be of any suitable form,but here consists of a bevel gear'61 fixed with gear47 and meshing withtwo oppositely rotating bevel'gears axially coinciding with, but

free to rotateon screw 49. The gears 63, 64, are

each provided with clutclrteeth on the opposite ends of a sleeveslidably keyed on screw 49, which willl be driven in. the oneV or theother direction accordingly as the sleeve 65 is shifted for the clutchteeth on the one or the other and to engage with the clutch faces of thebevel gears. The sleeve 65v may be shifted by the means of a hand lever66 xed on a shaft 67 upon which is also fixed a lever 68 having apivoted shoe 69 engaging with van, annular groove in the sleeve. By theabove described mechanism` tablev 6, may be driven from pulley 3l at anyof a predeterminedvariety of rates in either direction, but only ifclutch 16 is engaged to dri-ve the spindle. Reverser 48 also acts as amotionrinterruptcr Vfor stopping the table movementv at any point, thesleeve 65 having an intermediate unclutched position for such purpose.

The knee 4, machine table 6 and saddle 5 mayV eachbe manually moved. Forthis purpose knee 4 is, provided with. a screw 70 rotatably xed against.axial movement relative thereto and engaging a nut 71 fixedwith the baseof the col- Screw may be,- manually rotated by the means. of, a shaft 72connected with the screw by bevelgears73, 7431116. having a squared end72a adapted to receiveV a suitable crank, not shown. rlhe saddle may bemoved by the means of a screw75 rotatably xed in knee 4 and having asquared crank end 75a and engaging a nut 76 ixed with the saddle.4 Table6 may be moved by the` means of a suitable' crank applied to eithersquared end- 49a or 49h of screw 49.

Ther table 11 may be driven from pulleyV 3 by the means of shaft l2,gears 13, 1,4, a gear 77 meshing with gear 14, shaft 78, gears 79, 80. ashaft 81, a, shaft 82, Fig. 3, J'Ournaled in base 8 and driven fromshaft 81 by the means or"y an extensible universal joint shaft ofsuitable form and generally denoted by the numeral 83, a shaft '8.4,vaxially aligned with shaft 82 and connectible therewithby the `means ofamotion interrupting clutch generally denoted by the numeral 85, bevelgearsI 86, 87, (Fig. 4) a gear 83 xedwith bevelgear 87, a gear 89Imeshedwith gear 8,8,- and an indexing device. This device includes a drivermember 99 and 91, Figs. 3, 4, 1 1, fixed with gear 89., and drivenmembers 92, 93. and 9 4, Xed one.. stud 95 which is axially concentricwith therotary movementof table 11 and xed therewith by means of screws96. Each Y l rotation of the driver members gives to the drive` Y enmembers and to table l1 a half revolution, as

follows.

will start the movement of members Y90 and 91 in the arrow directionFig. 11. vA, camA roller 97 pivoted onmember 90 thencontacts acam face98 on member 93l and starts turningstud 95 and table 11.' The form ofthe cam face is such as to pick up the movement at a low angular rateand accelerate to ag fast angular rate correspond- The parts being inthe relative position shown in Fig. 11, engagement of clutch ing to theangular rate transmitted from a gear Y segment 91a. on member 91 toagear segment Y v 94a on a'member 9,4, and the parts are positioned Atoswing the segments into mesh, after whichA the segments transmit auniform high angular rate until they revolve out of engagementl ow` ingto the cut away portions. disengagement a cam surface 98h will havebeenJust vbefore ,suchV rotated to contactwith' afroller99, then,pos`i.

tionedapproximately asindicated by the dotted outline 99d. After vthesegments disengage, the relation of cam face 98 and roller 99, as theymove, is such as to force a deceleration of the angular velocity ofV thetable until the tableris again stationary khaving completed a halfrevo`v 7 lution, although members and91 have completed a fullrevolution, aiter which clutch 85is disengaged. as will be laterdescribed.

A cam roll 100 pivoted" on member'- 90 acts,

against a cam face 10.1 on member 92 during acf celeration and a camroll 102 on member 99v acts'g against a cam face 1,03 on member 92yduring decelerationA which in combination'with the described cains androlls, insure that the driven parts cannot be angularlydisplacedfromrthe er predetermined instantaneous positions.

The half revolution of the table 11 positionsA similar cam grooves 98a,98o, 101e and 103affor similar actionk during another half revolution,and such indexing of table 11 may be repeated indefinitely.

. Means are provided for accurately positioningl Y the table 11 asfollows. A locating plunger.104;` Figs.' 3, 4, V14, is slidably tted ina suitable slot in base 9 and may engage with notches positioned atdegrees in table 11, one of'which is shown:

at 105, Figs. 3414. A, leverl 106 pivoted on stud-v 107 is connectedwith plunger 104 by thermeans of a pivoted link 108 havingpivot pins109, 110. A, springl 111 pulls the lever and link in a direction toengage the plunger with the slots. ,andV Y swings an arm 106er,v oflever '106, toward a 'two lobed c am`1l2, Figs. 4 and 12,rotatableonstud 95. Cam 112 is revolved by the means of a gear 1,13 exeatherewith, and engaged yby annihilated gear 114 iixed Withgear 89.v The,parts 'arey in the position shown in Fig. V12 at vthe time that thetable indexing movement of member 901s started, vbut` during aninterval'before the table` starts to move the cam'112 has movedsuiiicient ly that the point 106:1 of lever 106 hasbeen forced back Vbythe cam portion 112m, therebyV disengagingthe plunger 104 to permit thetable to turn.

The teeth of gear 114 are cutaway over a considerable portion of theperiphery and afterl cam 112 has been moved rsufciently towithdraw-'ther parts then .stand again as in Fig. 12 except that it isnow the other lobe of cam 112 which co-acts with lever 106 and the cutaway portion thereof permits spring 111 to re-engage the locatingplunger. l

Means are provided for clamping and releasing the table 11 and base 9,Vas follows. A- pair of plungers or sliding members 115, 116, Figs. 3, 5and 14, are guided in suitable slides in base 9. The members may bethrust apart endwise by the means of a toggle device including members117, 118, the toggle pivots including p-ins 119, 120, 121, suitablyseated in opposed members, there being removable blocks 121e and 119sproviding seats in members and 116 respectively. The memb-ers arecontinuously pressed in the one direction by spring pressed plungers 122positioned for a combined thrust and in the other direction may be movedagainst the pressureof the plungers by the means of the cam surfacesl12a and 11219 on cam 112, Figs, 12-14, which as previously describedalso serves to move the plunger 104. The cam surfaces act against aroller 123 associated with pivot pin 120. 1n the position of the partswhen the table is stationary the cam is cut away sumciently that thespring plungers move the toggle to thrust the ends of clamp plungers115, 116, strongly against angular bearing surface 124e of blocks orabutments 124 fixed on table 11 thereby pulling the table downwardly toseat its lower surface against the top surface of the base, whereby alarge clamping friction is set up both between the plunger ends and theangular abutment surface and between the opposed table and basesurfaces- Cam 112 is driven as previously described to move before thetable moves and such movementis suicient to cause the cam surfaces 112mor 11219 to thrust against the spring plungers to relieve such pressurebefore the table starts to turn, the position of the parts then being asshown in Fig. 14. After the table movement is completed and locatingplimger 104 had entered its notch as previously described, the cut awaycam por-- tions permit the spring plunger to again clamp the table. s

The ends of the pivot pin are extendedto move in slots 120D, Figs. 3 and5, which are sufficiently free to avoid binding during clamping. Slotsare also provided, in thev toggle members as at 125 to provide space forpins as pin 126v fixed in the base and springs as spring 127 whichthrust -the toggle members toward the central pivot pin, thus tending toprevent the clamp ends from dragging on the rotating table parts and, inco-operation withthe slots for the central pivot pin keeping the entiretoggle mechanism centrally located and in proper position at all times.

In addition to the clamping mechanism just described there is an exactduplication of such mechanism oppositely disposed with reference to thetable axis. A portion of such duplicate mechanism is 'shown'in Fig. 3including clamp plunger 1150i and spring plunger 122e.

When the table 11 is unclamped, and during its turning movement theweight of the tablev is lifted from the top bearing surface of the baseand supported onfan anti-friction bearing as follows. `A thrust bearinggenerally denoted by the numeral 128V Figs. 4-9-9ci, consists in thisinstance of a lower ring or thrust plate 129, an upper ring or thrustplate 130 and a series of ballsof which ball 131 is typical, arranged toroll between the rings. The combined vertical thickness of the ringsandballs is slightly less than the recess space provided therefor betweenthe base and table, but during. unclamping the lower plate is thrustupward to lift the table through the thrust bearing, the position of theparts then beingV as shown in Fig. 9a. For this purpose each of thetoggle parts 11'?, 118, and the similar oppositely disposed partsreferred to, are provided with associated lifting means of which themeans illustrated in Figs. 9-9a for the toggle part 118 is typical,consisting of a bore 132 in part 118,a bore 133 in base plate 9 andballs 134, 135, in the respective bores. The arrangement is such that asthe toggle member 1.13 is moved as described for clamp release, the ball134 presses ball 135 andv bearing 128 upward until the table is liftedand is supported by Vthe bearing, the balls of the several togglemembers providing four points of support for the bearmg'symmetricallyarranged about the table axis;V Thus the table l1 is lifted from itsbase bearing before it starts to turn and is dropped again beforeclamping, but after the plunger 104 has operated to relocate the table.Such action has many advantages, principally that wear is avoided andthedecreased friction enables the plunger `104-to mo-re accurately positionthe table. YThe relative timing of the above described movements isdetermined by the form and relative position of .the parts, and isparticularly advantageous in that a relatively very large part of thetotal time consumed is utilized for turning the table 11, giving arelatively slow maximum table movement. Thus the' strains due to tableinertia, both in acceleration and deceleration which are materiallyreduced rby the substantially harmonic motion-of the table during suchperiods, are still farther reduced. This Vis illustrated'in'thediagrams, Figs. 11 and 12.

The parts arranged about the two centers move in the direction of thearrows and the parts aref shown inthe position occupied when the tableisv stationary. When the indexing operation starts, both the member 112and member 90 lstart to move immediately; After approximately 20 degreesof movement of member 112, lever 106 has completely withdrawn lockingplunger 104, as shown Fig. 12. ter a further movement for a total ofapproximately 60 degrees movement of member 112. the table is completelyunclamped, the vaction being apparent for the clamp roller 123, Fig. 12,and being similar for the roller of the other clamp. A 5G degreemovement of member 112 is, owing to the ratio of gears 114 and `113,equivalent only to approximately 55 degrees of movement of gear 114,and'of member 90 fixed therewith, as in dicalted on Fig. 11. Afterapproximately 60 degrees of movement of member 90, the roller 96contacts cam face 98 as indicatedl by the dotted line position 99a andtable 11 starts to move. At completionof the degree table movement, themember 112 has moved through an angular distance such that the roller123 now stands approximately in the relative position indicated at123er. The movement of Ymember 112 has not been uniform, there havingbeen a considerable dwell caused by the cut away portion of lgear 114.After a further movement of approximately 25 degrees of member112,.corresponding to approximately 23 degrees of member 90, the member112 has again permitted the table clamps to operate and the member 90trips out the clutch member 8519 as will be Ydescribed and 'the indexingis completed.` Member 9G has 360 degrees of movement of whichapproximately 60 degrees are used before the table starts to move V:is

and approximately 23 degrees after the table has completed its movement,giving approximately 277 degrees for table movement whereby suchmovement may be relatively slow.

The above movements or" indexing, clamping andlifting the table 11 areperformed by power lderived from shaft 82 and controlled by clutch 85.Clutch 35 in this instance consists of a inember a fixed on shaft S2 anda member 85h slidably keyed on shaft 84 the members being provided withcomplementary clutch teeth 85o adapted to engage or disengage as member85h is properly moved. Member 85h may be moved by/ the means or" a'lever`136 pivoted on a stud 137, Figs. 3 and 10, having fork members1360, engaging an annular groove in member 85h. Lever 136 iscontinuously urged to engage'clutch meinber 85h by the means of a spring138, which simultaneously acts on .the lever and on a rod 139, tendingeontinuousiy both to turn the' rod and to pull it toward the peripheryof drive member 90, with which the rod end contacts, Fig. 11.

When clutch member 8573 is disengaged the end of rod 139 rests against acam portion 140 on .the periphery of member 90, Fig. 11, and a pin 141fixed in rod 139 rests against an abutment portion 142 on lever 136, andthe lever end is pulled against pin 141 as an abutmentpreventing thespring from causing engagement of the clutch member; For causing clutchengagement rodv 139 is provided with a lever 144, Figs. 3, 5, and-'13,the slottedV end of which engages a pin 145 fixed in a rod 146 slidablysupported in brackets 14'?, 143, for movement with table 6. The slidingmovement oi vrod 146 is iimited in one direction by a collar 149 xed onthe rod toabut the bracket 14'7, and in the other directionby a shoulder150 on a sleeve 151 xed on rod 146 for the shoulder to abut the bracket.vThe rod 146 is yieldingly pressed to the left in Fig. 13 by the meansof a spring 152 which thus assists spring 138 in urging the rod 139 forpin 141 to rest against abutment 142.` Preferablycollar 149 abutsbracket 147 just before pin 141 strikes its abutment 142.

Sleeve 151 is knob-shaped for manual operation of rod 146 to theV rightin Fig. 13, and if so operated rod 139 is turned suiiiciently todisengage pin 141 from the end 142 of lever 136, whereupon spring 138immediately engages clutch member 85h and a power index movement oftable 11 starts. But as soon as member has turned sufiiciently, a cutaway portionY of its periphery permits rod 139 to be pulled by spring138 to a position where pin 141 may again engage end .of lever 136 and.again rest against the abutment 142. VSubseouently when the cam portionof Ymember 90 has revolved to contact the rod 139,

the cam portion pushes the rod back to the position shown in Fig. 3 andwithdraws clutch member 85h from engagement, the table llkhavingcompleted a'hali revolution and the associated table clamping, liftingand locating mechanism having gone through the cycle of movement aspreviously explained.

In practice the device is used as illustrated by the following example.A work piece 153, Fig. l-is fixed to the table 11 by the means of asuitable holding fixture 154. The machine table 6Y is then fed to theleft'in Fig. 1 for a cutter such as gang 155 operated from spindle 2, toact on the work piece. After the cutter has passed over the work piecethe table movement is reversed by the means of lever 66 and reverser 48,to return to its starting position. As soon as it is sufficientlyretreated for the cutter to disengage from the work piece, the table 11is caused to'index through a half revolution, thereby bringingintocutting alignment al second work piece 156 iixedV on the oppositeside of the axis of table 11 by the means of a econdxture 157. Duringcutting of such ,L

second work piece the first orV finished work piece is removed and anunnished piece inserted. Such operation may be continued indefinitely.To

avoid the necessity for hand trip of the indexing,y

the index movement may be controlled from the movements of the machinetool members'. asl follows: A dog 158, Fig. 13, is fixed on saddle, 5 toact against a trip member 159 adjustablyfixed on rod 146. Duringthe'return movement of. table` 6, to the left in Fig. 13, the dog pointcontacts the point or" a plunger 160, slidable in trip mem-v ber 159 andpressed outwardly by the means of a spring 161 to Contact the dog.Spring 161 .is suiiciently strong to overcome springs 152 `and 138, androd 146 is moved to start the indexing, but ir" table 6 shouldberequired to retreat a further amount, the rod 146 is stopped by theshoulder on sleeve 151 and the plunger 159 re-r treats to let the dogpassi. Duringy forwardtableV movement therod is prevented from movementby the collar149 and the plunger retreats-tolet at either Yor both 4endsof its reciprocatory move-4 nient and with well known devicesk forincreased rate of travel during idle or non-cutting 'mover ments, Vthusproviding automatic control of all the relative work and tool movements,but such control devices for table 6 being well'known in various formsare not shown. 1

. What is claimed is: Y

1. A machine tool comprising atoolspind1e,. a reciprocable support, anindexable table car-A ried by said support adjacent said spindle, aV*drive g train for said spindle including a motioninterrupting clutch,a first branch train from said' drive train tosaid. support andconnected to be driven through said clutch, a secon'dbranch train forthe indexing of said table connectedwith said drive train to excludesaid clutch and including engageable clutch members, means actuated fromsaid rst branch train for causing engagement of said clutch members andmeans actuated from said second branch train for disengaging saidYclutch members. g

2. A machine tool comprising a` rotatable tool spindle, a r-eciprocablesupport, atable rotatably indexable on said support, a powersource, afirst power train connecting said-source a motion interrupting clutchand said spindle in the order named, a second power train connected withsaid power source through said clutch and with said support andincluding a reverser, a third power train connected with said powersource. independently of said clutch and including a clutch cone trolledindexing device; and means for controlling the clutch of said deviceincluding clutchv engaging trip members actuated for relative movementVthrough said reverser, and clutch disengaging trip members actuated for'relative' movement throughthe last mentioned clutch. i

3. AV machine. toolcomprising a rotatable tool 76T y spindle, areciprocable support, a table rotatably indexable on said'support, apower source, a first train connecting said source and spindle through amotion interrupting clutch, a second power train driven from said l'irsttrain through said clutch and connected with said support through a ratechanger, Va third trainA driven from said irst train exclusive of saidclutch and connected with said table through a clutch controlledindexing device; and means for controlling the clutch of said deviceincluding clutch engaging trip members actuated through said ratechanger for relative movement, and clutch disengaging trip membersactuated through the last mentioned clutch for relative movement.

4. In a milling machine the combination of a base, a rotatably indexabletable, said table and base having surfaces mutually contacting forsupport kof said tabl-e, a clamp member having opposite movementsrespectively for unclamping and for clampingengagement of said surfaces,a rotatable driver, intermittent gearing connecting said driver andclamp member for said opposite movement respectively during a iirst anda last portion of a revolution of said driver, and a transmission trainconnecting said driver and tablel including intermittent gearingconnecting said table to be rotated iromisaid driver only during anintermediate portion of said driver revolution, and cam means operativeduring other portions of said driver revolution to accelerate and todecelerate the rotation of said table.

5. In a milling machine the combination of a rotatable tool spindle, asupport movable relative thereto in a cutting direction and in thereverse direction, a table carried by said support and adapted to berotatably indexed about an axis transverse both to the axis of saidspindle and to the path of support movement, a rst drive train forrotation of said tool spindle including in the order recited a powersource, a motion interrupting clutch and said spindle, a second drivetrain for movement of said support and connected with said power sourcethrough said clutch, a third drive train for movement of said table andconnected with said power source independently of said clutch andincluding clutch members relatively shiftable for engagement and fordisengagement, trip means for engagement of said clutch members andoperable from said second train only during said reverse direction ofsupport movement, and power means for the subsequent `disengagement ofsaid clutch members after said table has completed a predeterminedindexing movement.

6. In a milling machine the combination of a rotatable tool spindle, asupport movable relative thereto in -a path transverse to the axis ofsaid spindle and in a cutting direction and in the reverse direction, atable carried by said support and indexable to present different workpieces one after another to be operated upon by said f cutter, a spindletransmission including in the order recited a power source, a motioninterrupting clutch and said spindle, a first branch line transmissionfor movement of said support in either of said directions and connectedto be actuated from said power source through said clutch, a secondbranch line transmission for indexing movement of said table andconnected to said power source independently of said clutch, said secondbranch line including clutch members relatively shiftable forestablishing and interrupting said indexing movement, trip means forshifting said clutch members to establish said indexing movement andoperable from said first branch line only during said reverse movementof said support, and power means for subsequently shifting said clutchmembers to interrupt said indexing movement.

7. In a milling machine the combination of a rotatable cutter spindle, atable rotatably indexable adjacent said spindle, said spindle and tablebeing relatively bodily movable in abutting and in a return direction, aspindle transmission including in the order recited a power source, amotion interrupting clutch and said spindle, a power train for one ofsaid directions of relative bodily movement and driven from said sourcethrough said clutch, a power train for indexing said table and connectedto be driven from said source at a point unaffected by said clutch, saidtrain including members relatively movable to establish and to interruptindex movement of said table, automatic means for movement of saidmembers during said return movement of said table to establish tableindexV movement, and automatic means to subsequently move said membersto interrupt index movement; whereby said table may be automaticallyindexed during a return movement of said rsupport and during a periodwhen said spindle is idle.

EDWARD J. KEARNEY. JOSEPH B. ARMITAGE.

